Switchboard lamp



May 17, 1932. A. CORBETT SWITCHBOARD LAMP Filed Aug. 13, 1927 INVENTOR Alfred Corbett ATTdRNEY H ALFRED Patented May 17,1932

OORBETT, or IRWIN, PENNSYLVANIA, ASSIGNOB 'ro wEstrINerrousn na ic & MANUFACTURING'COMPANY,.A. CORPORATION or PENNSYLVANIA ssasie swrrcniaoann LAMP,

Application filed AugustlB, 1927. Serial No. 212,867.

My invention relates to switchboard lamps and particularly to pilot lamps for indicat into which a threaded lens and resistorele' ment may be removably mounted andwherein the resistor element serves as a support for the lamp socket orreceptacle. a f

These and other objects that willbe mad'e apparent throughoutthe further description of my invention are attained bymeans of the switchboard hereinafter described and illustrated in the accompanying drawings, wherein Figure 1 is a longitudinal sectionthrough a switchboard pilot lamp, Fig. 2 is a front elevational view of the lamp shown in'Fig'Land p Fig. 3 is a longitudinal section illustrating a modified manner of mo-unting'the device shown in Fig. 1.

Referring to the drawings, the lamp come prises a pair of threaded shells 3 and 4 that are provided with flanges 5 and 6, respectively, the shell 3 fitting within the shell 4 and having threaded engagement therewith. The shells are made of thin sheet metal and are formed by drawing and forming processes in such manner that the shells are externally and internally threaded, as indicated in Fig. l. r

The shells are adapted to be mountedin an opening 7 in an insulating'panel board 8 or in a sheet metal panel board and are securely clamped therein by turning one shell with respect to the other until the flanges 5 and6 engage opposite faces'of the panel. 'After the shells have been clamped in position, relative rotary movement of the shells with respect to one another and with respect to the panel is prevented by means of screws 9 that are threaded into the paneland which secure the flange 6 thereto.

The shell 3 isprovided with a pair of oppositely disposed internally projecting stop lugs 11 which serve as a limit stop for a resister element 12 having an enlarged thread ed head portion 13 which is screwed into the shell 3 until the inner face thereof engages the stop lugs 11. The resistor element 12'is of the usual type for reducing the voltage supplied to the pilot lamp 10, that is mounted in a socket member 14: that is'attached to the enlarged end l3 of the resistor element 12.

Since the stop lugs 11 are carried by the shell 3 which is mounted in-the front face of the panel, the socket 14% will oc'cupya predetermined relative position with respect to the front of the panel, regardless of the thickness of the panel. It will be noted that since the shells 3 and a overlap one another to a considerable-extent, the shells may be mountedin panels of diiferentflthicln iess without necessitating alteration of the dimerisionsofthe shells. I

-When' the socket member is applied to a sheet metal board 16, or a board, of less thick ness-thanthe'length of the front shell 3, asillustlrated in'Fig; 3, the shell dis reversed and is screwed upon the shell 3' with the flanged end first engaging the shell3. 1 An vexternally]threaded glass lens 15 is threaded'into the shell 3 and serves to-pro-' tect the lamp l0. The lens may be made" of i glass having any desired color to distinguish circuits, one from the other.

By reason of the constructionabove .described, theresistor elements may be removed for inspection or replacement'f by simply turning them counter-clockwise and unscrewing them from the socket. The lens may similarly be removed for gaining accessto. the lamp and socket for the purpose :of inspection or replacement; I While I have illustrated but one embodiment of my invention, it will be apparent to those skilled in the art that various changes,

modifications, substitutions, additions-and omissions may be made in the apparatus illustrated' without departing from the spirit and scope of my invention as set forth in the appended claims.

I claim as my invention:

1. A switchboard lamp comprising a socket member consisting of a pair of complementary threaded shells having threaded enment disposed in the-other end of the socket member, and having a lamp receptacle mounted on the inner end thereof.

A'switchboard lamp comprising a pair of complementary threaded shells having threaded engagement with one another and disposed within an opening in a switchboard panel and constituting an internally threaded socket member, a lamp socket for receivinga lamp and supported by the shells, the outer -GlldSl of the shells having portions of greater width than the diameter of the opening for engaging the opposite faces of the panel andtor clamping the socket in operative positions, a lens threaded into one end of the socket member and -a resistor element threaded into the other end thereof.

4. A switchboard lamp comprising a pair of "complementary threaded -.shel-ls having threaded engagement with one another and disposed within an opening in a; switchboard panel and constituting an internally threadedsocket member, the outer endsof the shells having portions of greater width than the :diameter=of:.tl1e opening forengaging the opposite faces of the panel and for clamping the socket inoperative positions, a lens threaded into one end .of the socket member, a resistor element threaded into the other end thereof and a lamp socket mounted .on the resistor aelement.

j 5. A switchboard lamp comprising a pair of complementary threaded shells having threaded engagement withone another and disposed within an opening in a switchboard panel and constituting an internally threaded socket member, the outer ends of the shells having portions of greater fWldtll than the diameter of the opening for engaging the oppos'ite'faces ofthe paneland for clamping the socket inoperative positions, internally extending stop members on one of the shell -members, a lensthreaded into :one ,end of the socket member, a resistor element threaded into the other end thereof and engaging the stop members and a lamp socket mounted on the resistor element. 6. A switchboard lamp comprising a sockets member consisting of a pair of complementary press-threaded metal shells, threaded inment of the shells, and the shell having the member engaging the front face of the panel being the innermost shell, a threaded lens threaded into the internal thread of the innermost shell a threaded lamp socket support threaded into the internal thread of the same innermost shell.

7. A switchboard lamp comprising a socket member consisting of a pair of complementary press-threaded metal shells, threaded interiorly and exteriorly and having threaded engagement with one another, and disposed within an opening in a switchboard panel, the said shells being provided with external members for engaging opposite sides of the panel and preventing longitudinal displacement of the shells, and the shell having the member engaging the front face of the panel being the innermost shell, a threaded lens threaded into the internal thread of the innermost shell and ,a threaded lamp socket support threaded into the internal thread of the same innermost shell, the said innermost shell having an inwardly extending stop member for limitingthe position of the said support in the innermost Shell.

.In testimony whereof, I have hereunto-subscribed my name this 3rd day of August 1927.

GORBETT.

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